Aeles claeke



Feb, 20, 1923. 1,4453%.

0. c. PUCKETTE. IGNITION SYSTEM FOR INTERNAL COMBUSTION ENGINES.

FILED nusls. 1921.

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IGNITIGNSYSTEM FOR 'INTERNAL-CGMBUSTIOH ENGINES;

Application filed. August 9, 1521. Serial No. 496,923.

enanrnn unnnnirnn raovrsrens or, THE ACT or MARCH 3,1 1921,41 s'rar. n, 1313.

To all whom it may concern: i Bent known, that 1,,CI-IARLES CLARKE Q Pncnn'r'rn, a citizen, ot the ,United States of An'ierica, residing at Peel Works, Adelphi,

Salford, Lancashire, l lngland, have invented certain, new and useful lmprovements in an ignit on System for Internal-Combustion Itngines (tonwhich l have n ed application in 1t511g1and May 23, 1919,- Patent No.

1 431,047), otjwhich thetollovving is a speciti cation, such Will enable others lskilleddn the artto which it appertains to make and.

use the same.

This invention relates to an improved i5 unispark ignition system of theseparately excited inductioneoil type suchas that em: ployinga'battery oran accumulator or a gdynamo as the primary source of current.

Battery, or the like systen'is in which the single spark method of igniting the explosive gases in internal combust on engines 1s employed, usually include an induction coil Whose primarylwinding is of comparatively low self induction, a timing interrnpterawhichbreaks the primaryv circuit, at certain intervalslduring the rotation of the engine conntershattguand in thefcase of a inulti cylinder engine, a distributor associated Withthe secondary circuit The. dry

tributor and interrupter are generally mounted as one unit.

, The great disadvantageofsuch unispark systems employing abattery or other source of low voltage, to suit the primary, is that at the Veryhigh speeds the duration oi the contact of the timer electrodes isnotsuliicient to enable the core ot'the induction coilto build up a maximum field before interruption of the, primary circuit is effected,

40 andthis results inawealr secondary spark, that is unless the resistance and seli indnction of thepriinary be made abnormally If in order to assist the field of the core to build up sufiiciently, at the high-speeds,

that is, When the contact between the electrodes of the timer is of short duration, a comparatively high, voltage be used; sayb to 12 volts, it is necessary to incorporate m the circuit, a limiting orregulating re sistance, otherwise at low speeds, or should the engine stop with the ignition control switch ;closed, excess currents might flow rentsfiowing at low engine speeds would cause severe sparking at the contactsof the timer, shortening their life. i

The object of the present invention is to obviate these ditliculties and the manner in which I carry the invention into practice is now set forth, and is illustrated bythe accompanying diagrammatic drawings, where Fig. 1 is a diagrammatic showing of the ignition system, and Fig. 2 showsa modified construction of the core, shading coil and switch contacts A represents the core of the induction coil, 13 the primary vvind ing: and C the secondary Winding. The contacts of the timingcontact breaker or interrupter which is actuated by the engine are indicated by D, D the condenser by E and y the battery by F.

The induction coil ,n'iay have its core A provided with a nimarywvinding B of the usual low resistance and sniallinductance, but I arrange according to my invention that one end of the coreis surrounded by a shading orlagging coil G and at this end of the core A, I place the armature .H of a contact breaker Whosecontacts J, J are bridged by a resistance IQ which in my. improvedsystem takes place off the aforesaid current limiting or regulating resistance.

, By the action of the shading coil G a time lag between the maximum n'iagnetic saturation in the part ,of the core A surrounded by the primary Winding B, and the magnetic saturationin the shaded pole tip A. is provided, so that atthe low speeds hen the duration of the contact between the elec' trodes of the timer; 01' engine contacts D, D, is longand consequently the primary current has sufficient time in which to attain 95 its maximum, the magnetism builds up through the shading coil sufficiently to at tract the armature Hot the contact breaker,

without unduly wasting energy in the primary winding.

At high speeds, when the duration of contact between the electrodes D D of the timer is much reduced, the flux in the induction coil core A, while able to build up to its maximum'in the portion of the core embraced by the primary winding B, never reaches anywhere its maximum in the end A of thecore shielded by the lagging coil; therefore the armature H of the contact breaker is not attracted and the contacts J J remain closed, consequently the circuit is then operating with minimum resistance and the current will only be limited by the self induction or" the primary winding and the resistance of the circuit as a whole.

The shading or lagging coil G could either be simply a band of copper or aluminium, or it may be cast around the laminated core in aluminium or suitable metal. If desired, it may be of suitable dimensions to form a base on which parts may be mounted, and Fig. 2 illustrates a convenient method of so supporting the armature H and contacts J J on the shading coil G; by enlarging dimensions of this coil the parts Gr will carry the armature spring H at one side and the contact member J at the other side, the parts being suitably insulated as shown.

WVhat I claim is 1. An electric unispark ignition system having an induction coil, a primary winding therefor having a shunt circuit path including resistance, a lagging coil for one end of the i'nduction'coil to provide a time lag between the magnetic saturations of the: respective ends of the coil, and means controlled by the magnetic saturation of that end of the induction coil having the lagging coil to control the resistance shunt circuit of the primary circuit.

i 2. An electric unispark ignition system, having an induction coil, a primary circuit therefor. a shunt path for said primary circuit including resistance, and means for controlling the shunt path of the primary circuit, said means providing a time lag between the magnetic saturations of the respective ends of the coil.

An electric unispark ignition system, having an induction coil, a primary circuit therefor, a shunt path for said primary cir cuit including resistance, a lagging coil for one end of the induction coil to prevent magnetic saturation of that end of the coil simultaneously with the magnetic saturation of the opposite end, and means controlled by the magnetic saturation of that end of the induction coil provided with the lagging coil for controlling the shunt path of the primary circuit.

4:. An electric unispark ignition system, having an induction coil, a primary winding therefor, means for delaying the time period of the magnetic saturation of one end of the coil as compared with the other end of such coil, and means for introthrcing a resistance in the primary circuit under full magnetic saturation of the coil within the predetermined limit.

5. An electric unispark ignition system including an induction coil, a primary circuit, and means for varying the resistance of the primary circuit in accordance with the relative time period of the magnetic saturation of the respective ends of the coil.

6. An electric unispark ignition system including an induction coil, a primary winding therefor, a shunt circuit including resistance for said primary winding, a lagging coil arranged at one end of the induction coil, and a switch controlled by said end of the induction coil for controlling the shunt circuit.

7. An electric unispark ignition system having an induction coil, the iron core of which is provided at one end with a shading or lagging coil, consisting of short-circuited turns.

8. An electric unispark ignition system having an induction coil, the iron core oi? which is provided at one end with a shading or lagging coil for producing a time lag in the magnetic field around the end oi? the core shielded by the said lagging coil.

9. An electric unispark ignition system, including an induction .coil, a lagging coil provided at one end of the induction coil for producing a time lag in the magnetic field around that end of the coil, a resistance circuit, and contacts for controlling said circuit in connection with the primary winding of the induction coil, said lagging coil controlling the operation of said contacts in accordance with the magnetic saturation of that end of the induction coil provided with the lagging coil.

10. An electric unispark ignition system having an induction coil, the primary winding therefor having a shunt circuit path including resistance and a contact control for such circuit, and a shading or lagging coil fixed on the core of said induction coil and carrying the contact control for such shunt circuit.

In witness whereof I have hereunto set my hand.

CHARLES CLARKE PUG KE'llll l. 

